Pancake Day (aka Shrove Tuesday) is not on the same date each year (though it is always on a Tuesday). The actual date it falls on depends on a complicated set of rules described in the formula xy{a}/x%19*syR-up+3 where x is the relative brightness of the first full moon before Easter. Consequentially, it takes 2.8 Flipaflops of processing power to calculate the answer. That’s equivalent to roughly 15 million bitgrams or 18,000 data-ounces.